Cast aluminum rotor winding



R 1 950,197 c, S. TA

CAST ALUMINUM ROTOR WINDING Filed Sept. 26, 1931 IIII|||||l||||||IIIIIIII'IIIII|||||l||||||||||||||||I||||||||||ll |II|Illllllllllllllllllll Illl|Il||IIIIIIIIIIIIIIIIIIIIIIIIIIIIII -l|||||||ll||| INVENTOR. axe/L J 720 4 ATTORNE Patented IVlTtu' 6, 1934 'NITED sr'res GMT ALUWUM BEWEQE- Cyril T iler, New

Atom to Ltr Pee, at eoegtomtto.

Appiteotiom the provision core and through the c'zoresllote to tone the east aluminum winding. In some cases. one of which is the conventional squirrel the ousting formed is intricate and. uueuuei seotiou, and to. these and other oases use ciencies in the casting properties of pure eiu mum and some of its alloys have introduced menu featuring problems. Where fit mm-1mg oi conduotivity combined with. lightness ie deoited pure aluminum or aluminum beet-mg" only the usual end small amounts ofimouttt e, sue-i1 iron, silicon and copper, has been Alumi mum is not, however, particularly for eestmg intricate shapes, especially who e souudoese and structure]; uniformity ere desireoi the casting, and the problem which heretofore existed has been the provision of e, east aluminum motor Winding of satisfactory eoimtiness ouu struottuei imiiormity one to peovioe :2 Wind tog which also has a. suitably conductivity".

I provide, as a solution to this problem, at oust motor rotor winding mode of to hes been added e suifieient emouut of to brim; its; silicon content to between. bout 1 to per eeut by Weight. The may the impurities found in such meta institute, small amounts oi i contain ng such pure eiumiuum, is herein eomprei teem aluminum. I have found me? be mode of such materiel w that the cost winding so met} s the silicon content of the aluminum u" limits named, sound and umform struo and that winding has on eleotriee ssesist not ovet about 4.0 miorohms per eeuti As compared with previous east rotot my new winding-possesses very euperiot moi" tiee, It is, even when intricate in design, to and; free from costing defects. It H2223 u formiw oi struetm'e suitable for Fitteioui 7w own n tot. tat eeoi with its use us an iou l conduct-o1. Fite. eouduoti ity M13122 could pt'eviotusiy be oi tamed with. a. cast rotor having the prop ertieo above named.

K have, moreovet, discovered that the eieotrioei -sistivity my cast aluminum which is not met about to mierehms per centimeter cube and usually about to to microbme, may be oomiderubiy improved, it desired, by heetmg the oestet temperatures of about 2% to 15 to 25 hours for: best results. todiment of my invention is shown by the eooou" nytug drawing in which Fig. i is o side view oi 2;. common type oi induction motor rotor o it is; 2 cross section token on line I 6f THEE.

Th core of the rotor is built up of laminae having rot ti'vt'eutiei notches 2. 111 esseiueling the core the lamina are so positioned that oriroumtereutiei' notches oi? the several laminae are in subeteutiei alignment, thus forming longi meme; .Tooves in the periphery of the rotor. Elie ossemuied ooze pieced in at suitable moid metoi tutt'odueed which completely ves SUITOHHCZS the ends of the core the our times 3. The solidified eoneiuetor bets t in the grooves oi? the eore, 31y .42 ends by end times the uotm as a cast rotor wind e is mouuted on core and oontoiotug abet electrical resistiv. zieiorohms ee'o @Eiftfu t 

